Comment # 9 on bug 1190326 from Dennis Glindhart

Making sure the xen-blkfront module is being added to the initrd seems to solve
the problem:

# echo 'add_drivers+="xen-blkfront"' > /etc/dracut.conf.d/1-xen.conf
# transactional-update -c <NEWSNAPSHOTWITHKERNEL5.14> initrd

Then system can reboot into the new kernel/snapshot.

Any idea what change makes this necessary? (xen)-modules not being loaded
automatically anymore? Is there a better/more sensible way of doing this?

And is it possible to somehow make the upgrade path smoother not breaking
peoples existing systems when updating kernel?

(I will try to read/understand/experiment with how to combine this with
Ignition/Bootstrapping on MicroOS)